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Available options for core-provided aspect ratio are "auto", "NTSC PAR" and "PAL PAR". - NTSC PAR forces pixel aspect ratio of NTSC tvs always, regardless of game or core region - PAL PAR forces pixel aspect ratio of PAL tvs always, regardless of game or core region - auto works as following -- NTSC PAR is used when core region is set to auto and game region is NTSC, or core region is set to ntsc-u or ntsc-j. -- PAL PAR is used when core region is set to auto and game region is PAL, or core region is set to pal. -- 6:5 PAR is used for Game Gear games, if core options Borders and Game Gear extended screen are both disabled